Nw Mutation Test
Runs feature-scoped mutation testing to validate test suite quality.
Install
npx skills add nWave-ai/nWave --skill nw-mutation-test -g -a claude-code -y- Repository
- nWave-ai/nWave628
- Category
- Testing
- Updated
- 2mo ago
- License
- MIT
- Context cost
- Lightabout 1,344 tokens
- Runs scripts
- No, instructions only
What it does
Runs feature-scoped mutation testing to validate test suite quality. Use after implementation to verify tests catch real bugs (kill rate >= 80%).
NW-MUTATION-TEST: Feature-Scoped Mutation Testing
Wave: QUALITY_GATE Agent: Crafter (nw-software-crafter)
Overview
Run mutation testing against implementation files from the current feature. Extracts targets from the execution-log.json (see Target extraction)|generates feature-scoped configs|delegates to software-crafter. Uses cosmic-ray (Python)|PIT (Java)|Stryker (JS/TS/C#).
Mutation Testing Strategy
Projects declare a strategy via ## Mutation Testing Strategy in CLAUDE.md: per-feature | nightly-delta | pre-release | disabled.
Default (when unspecified): nightly-delta, the recommended mode. CI runs mutmut nightly against modules changed since the last run (the delta), keeping per-feature delivery gates fast. /nw-mutation-test performs an explicit, on-demand feature-scoped run regardless of strategy; under nightly-delta the in-wave Phase 5 gate is skipped and the work is handled by the CI nightly pipeline.
Target extraction
Implementation files are selected from the execution-log.json (completed_steps[].files_modified.implementation).
Context Files Required
docs/feature/{feature-id}/deliver/execution-log.json- Implementation file extractionscripts/mutation/generate_scoped_configs.py- Automated config generation (if available)
Pre-Invocation
Orchestrator performs before delegating:
